// Face to face respondents = 1
recode V160501 (1=1) (2=0), generate(ftf)

// Recode childrearing items 
recode V162239 (2=3)(3=.2)(1=1)(-9/-6=.), gen(auth1)
recode V162240 (2=3)(3=.2)(1=1)(-9/-6=.), gen(auth2)
recode V162241 (1=3)(3=.2)(2=1)(-9/-6=.), gen(auth3)
recode V162242 (2=3)(3=.2)(1=1)(-9/-6=.), gen(auth4)

// Estimated graded response model 
irt grm auth1-auth4 if ftf==1

// Graph category response curves 
irtgraph icc auth1
irtgraph icc auth2
irtgraph icc auth3
irtgraph icc auth4

